Swagger File Generation With Swashbuckle

Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        if (args == null || args.Length == 0) throw new InvalidOperationException("You must specify arguments.");

        var path = args[0];

        using (var server = TestServer.Create<Startup>())
        {
            var response = server.CreateRequest("/swagger/docs/v1").GetAsync().Result;
            var content = response.Content.ReadAsStringAsync().Result;
            File.WriteAllText(path, content);
        }
    }
}

Startup.cs

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        var config = new HttpConfiguration();
        var container = ConfigureAutofac(app, config);

        WebApiConfig.Register(config);
        
        app.UseWebApi(config);
    }

    public virtual IContainer ConfigureAutofac(IAppBuilder app, HttpConfiguration config)
    {
        var builder = new ContainerBuilder();

        builder.RegisterAssemblyModules(typeof(ApiStartup).Assembly);

        var container = builder.Build();

        // Allows the Autofac container to be accessed from the OWIN context.
        app.UseAutofacMiddleware(container);

        // Informs ASP.NET WebApi 2 to use Autofac when resolving dependencies
        // (e.g. dependencies in Controllers).
        config.DependencyResolver = new AutofacWebApiDependencyResolver(container);

        return container;
    }
}

WebApiConfig.cs

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services
        var formatters = config.Formatters;
        formatters.Remove(formatters.XmlFormatter);

        var jqueryFormatter = formatters.FirstOrDefault(x => x.GetType() == typeof(JQueryMvcFormUrlEncodedFormatter));
        formatters.Remove(formatters.XmlFormatter);
        formatters.Remove(formatters.FormUrlEncodedFormatter);
        formatters.Remove(jqueryFormatter);

        JsonMediaTypeFormatter json = config.Formatters.JsonFormatter;
        JsonSerializerSettings settings = json.SerializerSettings;
        settings.Formatting = Newtonsoft.Json.Formatting.Indented;
        settings.ContractResolver = new CamelCasePropertyNamesContractResolver();
        settings.NullValueHandling = Newtonsoft.Json.NullValueHandling.Include;
        settings.DateParseHandling = Newtonsoft.Json.DateParseHandling.DateTimeOffset;
        settings.DateFormatHandling = Newtonsoft.Json.DateFormatHandling.IsoDateFormat;
        settings.DateTimeZoneHandling = Newtonsoft.Json.DateTimeZoneHandling.Utc;
        settings.Converters.Add(new StringEnumConverter());

        // Web API routes
        config.MapHttpAttributeRoutes();

        config.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always;

        SwaggerConfig.Register(config);
    }
}